Device for incremental stamping by magnetic forming and associated method

ABSTRACT

Device to produce a stamped part includes a punch having a bearing surface, an anvil, a die and a magnetic field generator, provided in the punch, level with the bearing surface. The device is configured, in an initial position, so that: the bearing surface of the punch receives a portion of a first face of the blank, the anvil and the magnetic field generator are placed on either side of the same portion of the blank. The magnetic field generator being opposite a first face and the anvil opposite a second face of the blank, at a distance from the second face. The die is placed opposite the second face, level with another portion of the blank. The magnetic field generator applies pressure on the blank in a direction Z′Z of the anvil. The device includes two actuators to move the punch and the anvil, respectively, in the direction Z′Z.

FIELD OF THE INVENTION

The present invention pertains to the field of forming, moreparticularly stamping.

The present invention relates to a device and a method for stampingblanks by magnetic pulse for producing stamped parts, in particularparts called deep stamped parts.

BACKGROUND OF THE INVENTION

In the field of forming, in particular metal forming, stamping is a veryoften selected method because it is robust and well mastered.

Stamping is commonly used in industry, in particular in the automotiveindustry, in particular to form trim panels, such as a motor vehiclebonnet or door, because of the high admissible production rates.

Stamping is a forming method consisting in obtaining by plasticdeformation of a blank, under the action of pressure, a part of more orless complex shape.

The stamping device for implementing this method consists essentially ofa die and a punch of almost complementary shape, between which the blankis positioned. The shape is obtained by driving the blank under theaction of the punch in the die. The movement of the blank is generallycontrolled by a blank holder, imposing a retaining pressure thereon, inorder to reduce the appearance of wrinkles or tears on the final stampedpart.

However, in the presence of a part which is difficult to shape, inparticular a deep stamped part, the choice of the clamping force to beapplied on the blank holder proves to be difficult. If the force of theblank holder is too high, the wrinkles are removed but the risk oftearing is high. If the force of the blank holder is too low, the riskof wrinkles is high.

To produce deep stamped parts, alternatives to the stamping method areknown.

Among them, the hydraulic forming method can be mentioned. In thismethod, the blanks are formed by the action of a pressurised fluid.

The associated hydraulic forming device consists of a hermeticallyclosed enclosure formed in two portions including a hollow mould havinga recess complementary to the shape of the part desired to be obtained.The blank is placed inside the enclosure. A hydraulic pressure isexerted thereon pressing it against the recess of the mould. Thisquasi-static shaping method has the major advantage of dispensing withpunching and producing complex shapes, which are in particular undercut.However, high pressures are essential for forming, which tends torequire large tonnage presses for large parts. Therefore, this method ismainly used for the forming of tubular parts. One of the disadvantagesof the method is the cycle time, often several tens of seconds due tothe filling and pressurisation times.

Among the existing hydraulic forming methods, mention may be made of theElectro Hydraulic Forming method, known as the EHF method, which is, inturn, a high speed deformation method. Such a method has manyadvantages, in particular a significant reduction in elastic return andincreased formability of metals. However, the major disadvantages lie inthe need to bring the part to be formed into contact with water(corrosion possible and drying necessary) and water management.

Mention may also be made of hot forming methods, such as theSuperplastic Forming method, known as the SPF method. This method isbased on the ability of some alloys, for example titanium, to withstandsignificant deformation. These alloys, hereinafter called superplasticalloys, can reach elongations sometimes going beyond 1000% under certainconditions of temperature, of pressure and deformation while theconventional alloys generally deform only within a typical range of afew % to 50%.

The associated SPF forming device consists of a hermetically closedenclosure formed in two portions including a hollow mould having arecess complementary to the final external geometry of the part desiredto be obtained. The blank is placed inside the enclosure and fixedlymaintained between the two portions. A pressurised gas is injected intothe enclosure and presses the blank, while deforming it, against therecess. The pressure and temperature, of the order of 900° C. fortitanium alloys, must be perfectly controlled.

The obvious disadvantages associated with this SPF forming device andthe associated method lie in the cycle time, the cost and the fact thatonly some materials can be used.

OBJECT AND SUMMARY OF THE INVENTION

The object of the present invention is in particular to overcome all orpart of the limitations of the solutions of the prior art, in particularthose set out above, by proposing a solution which allows obtainingstamped parts, and in particular deep stamped parts.

To this end, the invention aims firstly at a device for stamping a blankfor producing a stamped part including:

-   -   a punch including a bearing surface,    -   an anvil,    -   a die,    -   magnetic field generation means, disposed in the punch, at the        bearing surface.

The term blank means a thin plate, in particular made of metallicmaterial. A plate is said to be thin when one of its dimensions issignificantly smaller than the other two, typically at least an order ofsize.

In an initial position, that is to say before the stamping phase, thestamping device is configured such that:

-   -   the bearing surface of the punch is intended to receive a        portion of a first face of the blank,    -   the anvil and the magnetic field generation means are intended        to be disposed on either side of the same portion of the blank.

The magnetic field generation means are facing the first face. The anvilis facing a second face of the blank, opposite the first face, at adistance from said second face. The die is intended to be disposedfacing the second face, at another portion of the blank.

The magnetic field generation means are intended for and configured toapply on the blank a pressure in the direction of the anvil, in adirection Z′Z.

The stamping device includes first displacement means arranged todisplace the punch, relative to the die, in the direction Z′Z. The punchis advantageously displaced in translation.

The stamping device includes second displacement means arranged todisplace the anvil, relative to the die, in the direction Z′Z.

The punch, the anvil and the die are preferably made of a metallicmaterial to contain the high pressures generated by the magnetic fieldgeneration means.

The stamping device according to the invention differs from conventionalstamping devices in that the stamping is not carried out by the punchitself, but by the magnetic field generation means.

Similarly, the magnetic field generation means are used differently fromthe conventional framework of a magnetic forming method which forms theentire blank at once. The magnetic field generation means are arrangedso as to generate magnetic pulses only on a portion of the blank. Therelative displacement of the punch relative to the generation meansallows displacing the area of the blank which will be affected by themagnetic pulses.

Such a device thus advantageously allows to work at high speed ofexpanding deformation, with the advantages that the magnetic forming canbring, such as obtaining radii of curvature less than 2 mm, fineengravings, or tight tolerances, as well as the avoidance of cracking ortearing of the material in areas with high elongation, in particular foraluminium.

Such a stamping device is thus particularly adapted for producingstamped parts, in particular deep stamped parts, without generatingtears in the part.

It is also adapted for making flanging edges, with the advantages of themagnetic forming mentioned above.

According to preferred embodiments, the invention also meets thefollowing features, implemented separately or in each of theirtechnically operative combinations.

According to preferred embodiments, the first displacement means includea linear actuator.

According to preferred embodiments, in order to obtain good efficiencyof the method, the magnetic field generation means are in the form of aflat coil, for example in a spiral. The coil is disposed substantiallyin a plane parallel to the bearing surface of the punch.

According to preferred embodiments, the stamping device includes a blankholder configured to maintain the other portion of the blank against thedie, to impose a retaining pressure on the movement of the blank,against the die in order to limit the formation of wrinkles.

The invention also relates to a method for stamping a blank by magneticpulse for producing a stamped part, from a stamping device in accordancewith at least one of its embodiments. The method includes the steps of:

a) positioning the blank in the stamping device,

b) subjecting the blank to a magnetic field caused by the magnetic fieldgeneration means so that a pressure is exerted on the first face of theblank in the direction Z′Z and presses said blank against the anvil,

c) displacing the punch by the first displacement means and the anvil bythe second displacement means, relative to the die, in the directionZ′Z,

steps b) and c) being repeated, preferably in a synchronised manner,until the desired shape for the finished stamped part is obtained.

Synchronised means that the steps are carried out either successively,one after the other, or simultaneously.

As the punch displaces, a magnetic pulse is generated by the magneticfield generation means, exerting, on the one hand, an axial pressure onthe blank in the direction of the anvil, pressing said blank on saidanvil, and on the other hand, a radial pressure on the blank in thedirection of the die, pressing said blank on said die.

This axial and radial double pressure advantageously allows deformingthe blank, without the risk of generating tears in the part desired tobe obtained and with excellent shaping precision.

PRESENTATION OF THE FIGURES

The invention will be better understood upon reading the descriptionbelow, given by way of non-limiting example, and made with reference tothe figures which show:

FIGS. 1 to 4, schematic sectional views of an embodiment of a stampingdevice according to the invention showing the successive steps ofstamping a blank,

FIG. 5, a schematic view equivalent to FIG. 1 illustrating a particularembodiment of the stamping device with a blank holder.

In these figures, identical references from one figure to anotherdesignate identical or similar elements. For the sake of clarity, theelements shown are not to scale, unless stated otherwise.

DETAILED DESCRIPTION OF THE EMBODIMENTS

A stamping device 10, as illustrated in FIGS. 1 to 4, is intended forstamping blanks 50, in order to produce stamped parts, in particulardeep stamped parts.

In an exemplary embodiment, the blanks 50 are made of a metallicmaterial, such as steel.

The blank 50 has a first face 51 and a second face 52, opposite thefirst one.

In a preferred non-limiting exemplary embodiment of the invention, thestamping device 10, as shown in section in FIGS. 1 to 4, is adapted forproducing buckets. Bucket means a stamped part having a hollowcylindrical shape, with or without a flanged rim.

The person will easily understand that the teaching of the presentinvention can be transposed to other embodiments.

In the present description, the terms such as upper, lower, high, low,left, right are used for the sake of simplicity, with reference to theorientation of the various elements presented in FIGS. 1 to 4. However,unless otherwise indicated, these terms characterise only the relativedisposition of these elements, after a possible imaginary rotationrelative to the effective orientation of the assembly in space.

The stamping device 10 includes a first frame 20 and a second frame 30.The first frame 20 may be a lower portion of the stamping device and thesecond frame 30, an upper portion, as illustrated in the figures.Alternatively, and without departing from the scope of the invention,the first frame 20 may be an upper, left or right portion, of thestamping device and the second frame 30, respectively a lower, right orleft portion.

First Frame

The first frame 20 is in the form of a first hollow body delimiting afirst open cavity 23, which is preferably central.

In a particular embodiment, the first open cavity 23 has a cylindricalshape, preferably of circular cross section.

As illustrated in FIGS. 1 to 4, the first hollow body is formed of alower portion 21 and a side portion 22, an inner wall 221 of whichdelimits the first open cavity 23.

A punch 40 is disposed in the first open cavity 23.

In the particular example where the desired final stamped part is abucket, the punch 40 is in the shape of a cylindrical body, preferablyof circular cross section, and of longitudinal axis Z′Z.

In the example of FIGS. 1 to 4, the longitudinal axis of the punch 40 isa vertical axis, preferably coincident with a longitudinal axis of thefirst open cavity 23.

The punch 40 is preferably full and made of a material capable ofcontaining the high pressures generated by the magnetic field generationmeans, for example a metallic material.

Said punch includes a bearing surface 41 and a side surface 42. Thebearing surface 41 is intended to receive a portion of the blank to bestamped. The side surface 42 is intended to be facing the inner wall 221of the side portion 22 of the first hollow body, when said punch ispositioned in the first open cavity 23.

The punch 40 is movable in the first open cavity 23. The punch 40 ismovable in translation along its longitudinal axis Z′Z between:

-   -   a retracted position, wherein said punch is located in the first        open cavity 23, and    -   a deployed position, wherein said punch is located outside the        first open cavity 23.

The punch 40 displaces in a direction Z′Z, to its deployed position. Thepunch 40 displaces in a direction ZZ′, towards its retracted position.

In the example of FIG. 4, the punch 40 is illustrated in the deployedposition.

First displacement means 43 are configured to displace the punch 40between the retracted position and the deployed position. The firstdisplacement means 43 are actuated manually or automatically.

In an exemplary embodiment, the first displacement means 43 include atleast one linear, hydraulic or pneumatic actuator, such as a cylinderoperating between the first frame 20 and the punch 40. In this exemplaryembodiment, preferably, the fixed portion of the linear actuator—forexample the cylinder body—is housed in the first open cavity 23 formedin the first frame 20. The movable portion of the linear actuator, forexample the cylinder piston, is capable of displacing out of the firstopen cavity 23 for deploying the punch 40 in the direction Z′Z andcapable of displacing to the first open cavity 23 in the direction ZZ′to return the punch 40 to its retracted position. In a particularlyadvantageous manner, control means control the first means 43 fordisplacing the punch.

In a variant embodiment, the first displacement means 43 are in the formof a support carrying a thrust screw capable of cooperating with thepunch 40 to displace it in translation along the longitudinal axis Z′Z.

The stamping device 10 also includes magnetic field generation means 60.

The magnetic field generation means 60 are disposed, at the bearingsurface 41 of the punch 40, inside said punch.

The magnetic field generation means 60 are configured to create amagnetic field concentrated in a delimited space and over a very shortperiod, as will be described later.

In a preferred exemplary embodiment, the magnetic field generation means60 are in the form of a flat coil, for example in a spiral. The flatcoil is preferably disposed in a plane substantially parallel to thebearing surface 41 of the punch 40.

The magnetic field generation means 60 preferably form an integralportion of an assembly which further includes an electrical energystorage unit and one or more switches (not shown).

The electrical energy storage unit is configured for and intended tostore moderate energy, for example of the order of a few kilojoules to afew tens of kilojoules (kJ).

In a preferred exemplary embodiment, the storage unit is a battery ofdischarge capacitors.

Second Frame

The second frame 30 is in the form of a second hollow body delimiting asecond open cavity 33.

In a particular embodiment, the second open cavity 33 has a cylindricalshape, preferably of circular cross section.

As illustrated in FIGS. 1 to 4, the second hollow body is formed of anupper portion 31 and a side portion 32, an inner wall 321 of whichdelimits the second open cavity 33.

The second frame 30 is arranged relative to the first frame 20 so thatthe second open cavity 33 is intended to receive the punch 40, when thelatter displaces along its longitudinal axis Z′Z, in the direction Z′Z,to its deployed position. A free end 322 of the side portion 32 of thehollow body of the second frame 30 is substantially facing a free end222 of the side portion 22 of the first hollow body of the first frame20.

The second hollow body and the punch 40 have dimensions such that thepunch 40 can displace, in translation, freely in the second open cavity33 and allow the passage of the blank 50, in its thickness, between theinner wall 321 of the second open cavity 33 and the side surface 42 ofthe punch 40.

In a preferred embodiment, the side surface 42 of the punch 40 and theside wall 32 of the second hollow cavity 33 are of almost complementaryshape, except for the thickness of the final stamped part and anoperating clearance.

In a non-limiting exemplary embodiment, when the punch 40 is in theshape of a cylindrical body, of circular cross section, the second opencavity 33 is cylindrical, of circular cross section, with a diametergreater than the external diameter of the punch.

In the example of FIGS. 1 to 4, and preferably, a longitudinal axis ofthe second open cavity 33 is coincident with the longitudinal axis ofthe punch 40.

The stamping device further includes an anvil 70.

The anvil 70 is housed in the second open cavity 33. Said anvil ismovable in the second open cavity 33. The anvil is movable intranslation along the longitudinal axis Z′Z, Second displacement means72 are configured to displace the anvil 70 in translation in the secondopen cavity 33.

The second displacement means 72 are actuated manually or automatically.

In an exemplary embodiment, the second displacement means 72 include atleast one linear, hydraulic or pneumatic actuator, such as a cylinderoperating between the second frame 20 and the anvil 70. In thisexemplary embodiment, preferably, the fixed portion of the linearactuator—for example the cylinder body—is housed in the second opencavity 33. The movable portion of the linear actuator, for example thecylinder piston, is capable of displacing in the second open cavity 33to displace the anvil 70 in said second cavity. In a particularlyadvantageous manner, control means control the second displacement means72 of the anvil 70.

In a variant embodiment, the second displacement means 72 are in theform of a support carrying a thrust screw capable of cooperating withthe anvil 70 to displace it in translation, along the axis ZZ′.

In a preferred embodiment, the first 43 and second 72 displacement meansare similar.

The stamping device further includes a die 80.

The die 80 is disposed at the free end 322 of the side portion 32 of thesecond frame 30. The free end 322 of the side portion 32 of the secondframe 30 forms a lower surface 81 of the die 80.

In a preferred embodiment, the side portion 32 of the second hollow bodyof the second frame 30 forms the die 80.

The anvil 70 and the die 80 are preferably made of a metallic material,for example steel, having sufficient structural strength allowing tocontain the high pressures generated by the impact of the blank 50 onsaid anvil and said die, during the stamping method which will bedescribed later.

The punch 40, the anvil 70, the die 80 and the magnetic field generationmeans 60 are disposed relative to each other so that, in an initialposition of the stamping device 10 (FIG. 1), that is to say beforestarting the stamping method, the blank 50 is positioned flat betweensaid various elements.

More specifically, the punch 40 is positioned so that its bearingsurface 41, in a retracted or intermediate position of said punch, isintended to receive a portion of the first face 51 of the blank 50. Inthe example illustrated in FIG. 1, the bearing surface 41 of the blankis intended to receive a central portion of the first face 51 of theblank 50. The anvil 70 and the magnetic field generation means 60 aredisposed on either side of the same portion of the blank 50. Themagnetic field generation means 60 are facing the first face 51 of theblank 50. A lower surface 71 of the anvil 70 is facing the second face52 of the blank 50.

The lower surface 71 of the anvil 70 is disposed opposite the secondface 52 of the blank 50, at another portion of the blank. In the exampleillustrated in FIG. 1, the lower surface 81 of the die 80 is disposedopposite the second face 52 of the blank 50, at a peripheral portion ofsaid blank.

The lower surface 71 of the anvil 70 is disposed at a distance from thesecond face 52 of the blank 50.

Preferably, as illustrated in FIG. 1, the magnetic field generationmeans 60, as positioned, are thus able and intended to apply on theblank 50 a pressure mainly in the direction of the lower surface 71 ofthe anvil 70, in the direction Z′Z.

In one embodiment, illustrated in FIG. 5, the stamping device 10includes a blank holder 90. The blank holder 90 is housed between thefree ends 222, 322 of the side portions 22, 32 of the first and secondhollow bodies. It is configured so that the blank is compressed betweenthe blank holder and the die, at the free end 322 of the side portion 32of the second hollow body, when said blank is in position on the punch40. The adjustment of the force of the blank holder and/or of theclearance between the blank holder and the die will condition theswallowing of the blank during its shaping by preventing or limiting theformation of wrinkles.

In an exemplary embodiment, the blank holder 90 is maintained pressedagainst the free end 322 of the side portion 32 of the second frame 30by compression means such as for example gas springs.

An example of a stamping method is now described.

The blank 50 is intended to conform to the shape of the lower surface 71of the anvil 70 and to the inner wall 321 of the side portion 32 of thesecond frame 30 to form a deep stamping, of the bucket type. The bucketobtained may or may not include a flanged rim.

In a prior step, the blank 50 is cut, to the desired dimensions (lengthand width, or diameter, and thickness), from a sheet.

In a first step, called step a), the blank 50 is positioned in thestamping device 10.

The blank 50, of substantially flat shape, is positioned between thefirst frame 20 and the second frame 30, as illustrated in FIG. 1.

In one embodiment, the blank 50 is disposed on the one hand, at itscentral portion, on the punch 40. The blank 50 is disposed so that itsfirst face 51 bears against the bearing surface 41 of the punch.

The blank 50 is disposed so that its second face 52 faces the lowersurface 71 of the anvil 70. The lower surface 71 of the anvil 70 ispositioned at a distance e from the second face 52 of the blank 50.

The distance e defines the desired depth for the deformation of theblank at each discharge (described below). The distance e is maximisedso as to reduce the number of discharges and consequently the formingtime.

The blank 50 is disposed on the other hand, at its peripheral portion,between the lower surface 81 of the die 80, therefore the free end 322of the side portion 32 of the second frame 30 i, and the free end 222 ofthe side portion 22 of the first frame 20. The second face 52 of theblank 50 is disposed facing the die 80, at a distance therefrom. Thefirst face 51 of the blank 50 is disposed facing the free end 222 of theside portion 22 of the first frame 20.

In an exemplary implementation, when the blank 50 was deposited on thepunch 40, said punch is displaced, from its retracted position, intranslation along the direction Z′Z, to offset the blank 50 so that thesecond face 52 of said blank, at the peripheral portion of the blank, isplaced in the immediate vicinity, for example of the order of amillimetre, of the free end 322 of the side portion 32 of the secondframe 30, therefore of the lower surface 81 of the die 80.

When the stamping device 10 includes a blank holder 90, the blank 50 ismaintained bearing against the free end 322 of the side portion 32 ofthe second frame 30 by said blank holder.

The method then includes a second step, called step b), of deforming theblank 50 by magnetic forming.

The central portion of the blank 50, located in the vicinity of themagnetic field generation means 60, is subjected to a magnetic fieldoriginating from said magnetic field generation means 60 so that anaxial pressure is exerted against the first face 51 of the blank 50, andtightly presses said blank against the lower surface 71 of the anvil 70.The arrow illustrated in FIG. 2 represents the direction of the axialpressure exerted on the blank 50.

Consequently, the blank 50 deforms to bear against the lower surface 71of the anvil 70.

During this step b) shown in FIG. 2, the magnetic field generation means60 progressively deforms the central portion of the blank 50 so as toobtain a first stamp of depth P1, less than a depth P of the final stampsought. The peripheral portion is pressed against the free end 322 ofthe side portion 32 of the second frame 30, therefore against the lowersurface 81 of the die 80.

The anvil 70 advantageously allows limiting the impact of the dischargeon the blank and avoiding a tearing thereof.

At the end of this step b), the blank 50 is deformed and has a firststamp.

In a third step, called step c), the punch 40 and the anvil 70 aredisplaced.

The punch 40 is displaced by the first displacement means 43, in thedirection Z′Z, until the bearing surface 41 of the punch is pressedagain against the first face 51 of the blank 50, so that the centralportion of the blank 50 returns in the immediate vicinity of themagnetic field generation means 60. The peripheral portion of the blank50 is maintained at a distance from the die 80, as illustrated in FIG.3.

The displacement of the punch 40 is carried out in the same direction asthe direction of displacement of the central portion of the blank 50during step b).

The anvil 70 is displaced by the second displacement means 72, in thedirection Z′Z.

In an exemplary implementation, the relative displacement of the punch40 and the anvil 70 relative to the die 80 is carried out incrementally,preferably simultaneously.

The displacement of the punch 40 and that of the anvil 70 is notnecessarily of the same amount.

The anvil 70 is displaced in the direction Z′Z by a sufficient distanceso as to define the desired depth for the incremental deformation of theblank.

In an exemplary implementation, the relative displacement of the punch40 and the anvil 70 is carried out continuously. The shaping of theblank 50 by the magnetic field generation means 60 can be consideredinstantaneous relative to the displacement of the punch 40 and to thatof the anvil 70. Indeed, the duration of the displacement of the punch40, and that of the displacement of the anvil 70, is generally very slow(of the order of a second) compared to the duration of the magneticpulse generated by the magnetic field generation means 60 (of the ordera few micro seconds). In the particular case of this embodiment, thesecond and third steps are carried out simultaneously without modifyingthe result of said steps.

In a fourth step, steps b) and c) are reproduced sequentially.

Steps b) and c) are repeated until obtaining the depth P of the finalstamped part desired to be obtained.

As the punch 40 and the anvil 70 relatively displace relative to the die80, said magnetic field generation means 60 advantageously exert anaxial pressure on the central portion of the blank 50 in the directionof the anvil 70, pressing the central portion of said blank on saidanvil. Said magnetic field generation means 60 also exert radialpressure on the blank 50 in the direction of the die 80, against theinner wall 321 of the side portion 32 of the second frame 30, pressingsaid blank against said inner wall. The horizontal arrows illustrated inFIGS. 3 and 4 show the direction of the radial pressure exerted on theblank 50. This radial pressure of the blank 50 against the inner wall321 of the side portion 32 of the second frame 30 advantageously allowssaid blank to perfectly match the shape of said inner wall.

The number of iterations of steps b) and c) depends in particular on thematerial constituting the blank, on the desired depth of the stampedpart.

At the end of the stamping method, the blank became a deep stamped part,of the bucket type, with or without a flanged rim.

In the example of FIG. 4, the bucket is of the type of bucket withoutflanged rim.

The present invention is not limited to the preferred embodimentsdescribed above by way of non-limiting examples and to the mentionedvariants. It also relates to the variant embodiments within the reach ofthe person skilled in the art.

The above description clearly illustrates that by its various featuresand their advantages, the present invention achieves the objectiveswhich it had set itself. Particularly, it provides a stamping deviceadapted for producing stamped parts, in particular deep stamped parts,without generating wrinkles or tears in the part. Such a stamping deviceand the associated stamping method allows working the part at highspeeds, and advantageously deforming the blank without the risk ofgenerating tears in the part desired to be obtained and with excellentshaping precision.

The invention also advantageously allows producing flanging edges.

1-5. (canceled)
 6. A stamping device to produce a stamped part from ablank, comprising: a punch comprising a bearing surface; an anvil; adie; a magnetic field generator, disposed in the punch, at the bearingsurface; the stamping device being configured, in an initial position,such that: the bearing surface of the punch is configured to receive aportion of a first face of the blank; the anvil and the magnetic fieldgenerator are configured to be disposed on either side of a same portionof the blank; the magnetic field generator facing a first face of theblank and the anvil facing a second face of the blank, opposite thefirst face, at a distance from the second face; and the die configuredto be disposed facing the second face, at another portion of the blank;the magnetic field generator configured to apply a pressure on the blankin a direction Z′Z of the anvil; a first actuator arranged to displacethe punch, relative to the die, in the direction Z′Z; and a secondactuator arranged to displace the anvil, relative to the die, in thedirection Z′Z.
 7. The stamping device according to claim 6, wherein thefirst actuator comprises a linear actuator.
 8. The stamping deviceaccording to claim 6, wherein the magnetic field generator is in a formof a flat coil.
 9. The stamping device according to claim 6, furthercomprises a blank holder configured to maintain the other portion of theblank against the die.
 10. A method for stamping a blank by magneticpulse, using the stamping device according to claim 1, to produce astamped part, comprising steps of: positioning the blank in the stampingdevice; subjecting the blank to a magnetic field caused by the magneticfield generator such that a pressure is exerted on the first face of theblank in the direction Z′Z to press the blank against the anvil;displacing the punch and the anvil, respectively by the first actuatorand the second actuator, in the direction Z′Z relative to the die; andrepeating the subjecting and displacing steps until a desired shape ofthe stamped part is obtained.